Implement Telegram API in Worker for secure messages | Telegram Bot Development & API Course
We convert our test Worker into a production-ready Cloudflare Worker that acts as a secure server for Telegram. Instead of keeping BOT_TOKEN and CHAT_ID on the frontend, we move form handling to the Worker, parse formData, send text and image requests to the Telegram API from the Worker, and return structured JSON responses.
We also deploy updates with Wrangler and debug common runtime errors so the flow is reliable and secrets never leak in DevTools.
🎞️ TIMESTAMPS 🎬
0:00 Intro
0:07 Project Overview
1:00 Prepare HTML Form to Send Data to Worker
2:50 Integrate Worker with Telegram API
8:09 Deploy Worker to Cloudflare
8:25 Testing the New Worker
8:37 Send a Test Message with Image via Worker
10:10 Bot Token & Chat ID Not Exposed in the Network Tab
10:41 Conclusion
11:20 Outro
🔷 What You’ll Learn in Ep.5:
✅ Convert a test Worker into a production-ready server-side Worker
✅ Move form handling off the frontend and POST securely to the Worker (no BOT_TOKEN/CHAT_ID on client)
✅ Parse FormData in the Worker and handle text plus image payloads
✅ Implement CORS, OPTIONS preflight handling, and origin validation
✅ Send messages and photos to the Telegram API from the Worker and handle API responses/errors
✅ How to use environment variables in Cloudflare Workers
✅ Deploy and update the Worker with Wrangler and perform basic debugging
🟠 Cloudflare Dashboard:
🔗 https://dash.cloudflare.com/
🖥️ Source Code (All Versions Included):
🔗 https://github.com/saeedkohansal/send...
🧑💻 Source Code (This Episode):
🔗 https://gist.github.com/saeedkohansal...
📜 Wrangler Commands:
🔗 https://gist.github.com/saeedkohansal...
🧑💻 Next Episode (Ep.6):
🔜 Deploy the entire project (frontend and backend) using Cloudflare Pages so the full Telegram data-sending app runs on Cloudflare
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